单项选择题

不同的一项是（）

A.dream
B.threat
C.beat
D.heat

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单项选择题
My students’sleepless nights became () as the examinations approached.

A. so frequently
B. much more frequently
C. more frequent
D. far more frequent than
单项选择题
I don’t think my eyes are as good as they used to be. I need to have them ()

A. tested
B. cleaned
C. serviced
D. cared
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